GREfiORY: XOTIIAHCrrs, AN AMERICAN EOCENE PRIMATE 



63 



Parts of skeletons of other members of the subfamily suffice to show that, as in the dentition, there 

 was a gradual increase in size as we pass from the older species of Pelycodus near the base of the 

 T^ower Eocene to the large Nothnrdus crassus at the summit of the Middle Eocene. 



Pectoral Limb 

 Scapula 

 Text FIk 1 



This element is represented by the lower part of the blade, the glenoid fossa, and the proximal part 

 of the coracoid process ( Fig. 1 ) of Nothardm osborni. By far the nearest resemblances of the part pre- 

 served are with the lemurs of Madagascar. 



The glenoid fossa, as seen from below, is like a slender pear, only moderately wide at the base. A 

 very similar form of glenoid is seen in a certain specimen of Lemur mongoz. In Cehus, Alouaita, and 

 Hapale the glenoid is relatively wider and flatter on the posterior border. The long diameter of the 

 glenoid fossa is 11.3 mm. as compai'ed with 11.5 in a Lemur mongoz. 



3 4 



1 2 



Fio-. 1. Comparative fii;iircs: lower part of right scapula of Xotharcfus and Lemur. Natural size. 



1. Nothardus osborni. Amer. Mus. No. 11474. Inner side. 



2. Lemur varius. Amer. Mus. No. 18040. Inner side. 



3. 4. Same specimens, front view. 



The coracoid process, so far as preserved, closely resembles that of Ijepilemur. As in that form 

 there was only a slight tuberosity on the front upper border of the coracoid for the coraco-clavicular 

 ligament, whereas in Cebus, Alouatta, and Hapale this tuberosity is very large and prominent. 



Immediately above the axillary l^order of the glenoid is a slight triangular roughening for the tendon 

 of the scapular head of the triceps. This roughening is similar in form to that in a certain specimen of 

 Lemur varius (Amer. Mus. No. 18040). 



